Quincy, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 43.1 °F (low) to 60.1 °F (high). Annual precipitation averages 50.8 Inches. Quincy is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.4 °F | 37.4 °F | 4.2 in. |
| February | 22.8 °F | 39.6 °F | 3.77 in. |
| March | 29.7 °F | 45.9 °F | 5.11 in. |
| April | 39.7 °F | 57.5 °F | 4.52 in. |
| May | 49.4 °F | 67.7 °F | 3.68 in. |
| June | 59.0 °F | 77.0 °F | 4.04 in. |
| July | 65.1 °F | 82.9 °F | 3.63 in. |
| August | 63.9 °F | 81.3 °F | 3.71 in. |
| September | 56.8 °F | 74.1 °F | 3.8 in. |
| October | 45.7 °F | 62.9 °F | 5.06 in. |
| November | 36.2 °F | 52.3 °F | 4.29 in. |
| December | 27.7 °F | 42.9 °F | 5.02 in. |
| Annual | 43.1 °F | 60.1 °F | 50.83 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |